The horizontal line across the center of the area is at Y=150/2. The top of the squares should be (300/10)/2 pixels above that, or at 150/2 - 15 (remember that Y increases going down.)

import java.applet.Applet; import java.awt.*; // assume that the drawing area is 300 by 150 public class tenCircles extends Applet { final int width = 300, height = 150; public void paint ( Graphics gr ) { gr.setColor( Color.red ); int count = 0 ; while ( count < 10 ) { int X = ____________; int Y = ____________; int R = ____________; gr.drawOval( ____,____,____,____ ); count = count + 1; } } }

So now we have the (X, Y) coordinates of the upper left corner of each of the ten squares: The left edges of the squares are at ...

X=0, 300/10, 2*(300/10), 3*(300/10), . . . . 9*(300/10)

... and all the Y values are at (150/2 - 15).

The X and Y in the above are local variables for exclusive use of the
`paint`

method.
It is correct to declare them as is done here.
The blanks should be filled in with arithmetic expressions that use
identifiers, not integer literals like 10, 150, 300 and so on.